Replace OStream with std::ostream.

src/compiler/common-operator.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_COMMON_OPERATOR_H_
 #define V8_COMPILER_COMMON_OPERATOR_H_
 
 #include "src/compiler/machine-type.h"
 #include "src/unique.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class ExternalReference;
-class OStream;
 
 
 namespace compiler {
 
 // Forward declarations.
 class CallDescriptor;
 struct CommonOperatorBuilderImpl;
 class Operator;
 
 
@@ skipping 101 matching lines @@
 
   const CommonOperatorBuilderImpl& impl_;
   Zone* const zone_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_